GlaxoSmithKline (GSK) launched an investigation with the FDA for its popular over-the-counter weight-loss drug Alli on Wednesday, saying bottles in at least seven states have been tampered with.

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It has not yet declared a formal recall, but is asking at this point that consumers cooperate with the investigation and inform the company if they inadvertently purchase a suspicious product.

Bottles affected will have clear signs of tampering, including a detached seal, removed labels, pills and capsules of all colors and sizes rather than the turquoise blue Alli capsules with a dark blue ring, as well as mismatched expiration dates.

The outside packaging may still appear authentic.

“We have launched an investigation after receiving reports from consumers that some bottles of alli have been tampered with,” a GSK spokesperson said.